Sigma detection rules, expert-reviewed

Windows Process Initiated Connections to Ngrok Domains

Alerts when a Windows process initiates an outbound connection to ngrok domain hostnames, which may indicate staging or C2 activity.

Windows Scheduled Task Creation Triggered Once at 00:00 Using Scripted Commands

Alerts on suspicious schtasks.exe task creation for a one-time 00:00 run with embedded script/command execution strings.

Sysmon DNS Query for anonfiles.com Domain

Flags Windows Sysmon DNS queries referencing anonfiles.com to support detection of suspicious data staging.

Windows Suspicious Service Creation via sc.exe or PowerShell New-Service with Abnormal Binary Paths

Flags service creation commands (sc.exe/New-Service) when the specified binary path includes suspicious directories or script/loader utilities.

Windows: Detect sc.exe Creating Kernel Driver Services

Flags sc.exe service creation where the command-line specifies a kernel driver type and binPath.

MSSQL sp_procoption Startup Execution Set/Clear via Application Log EventID 33205

Alerts on MSSQL sp_procoption being set or cleared for automatic startup execution via EXEC (EventID 33205).

Windows/MSSQL: Detect ALTER SERVER AUDIT or DROP SERVER AUDIT executions

Alerts on MSSQL ALTER/DROP SERVER AUDIT statements that disable or delete server audit coverage.

Windows MSSQL: Add Member to sysadmin Server Role (EventID 33205)

Alerts on MSSQL EventID 33205 when an ALTER SERVER ROLE command adds a member to the sysadmin role.

Windows Registry: Hidden User via Winlogon SpecialAccounts Userlist Value 0

Alerts on Windows registry updates that set Winlogon SpecialAccounts Userlist to DWORD 0 to hide users.

Windows: Base64-Encoded PE “MZ” Header Present in Command Line

Alerts when Windows command lines include Base64 strings matching a PE “MZ” header.

Windows: Local user creation via net.exe with expires:never

Flags net.exe user add commands that set expires:never for local account persistence.

Windows: Detect Suspicious mofcomp.exe Execution from Scripts or Temp Paths

Flags mofcomp.exe runs spawned by script interpreters or using temp/AppData paths, with exclusions for WmiPrvSE .mof-related activity.

Windows cmd.exe Output Redirection to User Writable Paths

Flags cmd.exe commands that redirect output (>) into temp/AppData and other commonly targeted directories.

Windows MSSQL xp_cmdshell Setting Change (EventID 15457)

Flags MSSQL xp_cmdshell setting changes using Windows application EventID 15457 events containing 'xp_cmdshell'.

Windows MSSQL xp_cmdshell Command Execution via Application Event 33205

Alerts when SQL Server xp_cmdshell is invoked to execute commands, using Windows application EventID 33205 data.